Playing on 1.15.2, the blocks are available in creative displaying the id instead of names. They can be crafted, but the recipe is only shown after the first craft (idk if this is intended). Follows some log
[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Block: Object did not get ID it asked for. Name: gates:xor_gate Expected: 680 Got: 682

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Block: Object did not get ID it asked for. Name: gates:xnor_gate Expected: 681 Got: 683

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Block: Object did not get ID it asked for. Name: gates:or_gate Expected: 682 Got: 684

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Block: Object did not get ID it asked for. Name: gates:nor_gate Expected: 683 Got: 685

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Block: Object did not get ID it asked for. Name: gates:transmitter Expected: 684 Got: 686

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Block: Object did not get ID it asked for. Name: gates:wireless_redstone_lamp Expected: 685 Got: 687

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Block: Object did not get ID it asked for. Name: gates:not_gate Expected: 686 Got: 688

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Block: Object did not get ID it asked for. Name: gates:thunder_detector Expected: 687 Got: 689

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Block: Object did not get ID it asked for. Name: gates:and_gate Expected: 688 Got: 690

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Block: Object did not get ID it asked for. Name: gates:fast_repeater Expected: 689 Got: 691

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Block: Object did not get ID it asked for. Name: gates:slow_repeater Expected: 690 Got: 692

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Block: Object did not get ID it asked for. Name: gates:receiver Expected: 691 Got: 693

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Block: Object did not get ID it asked for. Name: gates:rain_detector Expected: 692 Got: 694

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Block: Object did not get ID it asked for. Name: gates:nand_gate Expected: 693 Got: 695

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Item: Object did not get ID it asked for. Name: gates:redstone_torch_pearl Expected: 884 Got: 885

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Item: Object did not get ID it asked for. Name: gates:xor_gate Expected: 885 Got: 886

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Item: Object did not get ID it asked for. Name: gates:xnor_gate Expected: 886 Got: 887

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Item: Object did not get ID it asked for. Name: gates:or_gate Expected: 887 Got: 888

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Item: Object did not get ID it asked for. Name: gates:nor_gate Expected: 888 Got: 889

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Item: Object did not get ID it asked for. Name: gates:transmitter Expected: 889 Got: 890

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Item: Object did not get ID it asked for. Name: gates:wireless_redstone_lamp Expected: 890 Got: 891

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Item: Object did not get ID it asked for. Name: gates:not_gate Expected: 891 Got: 892

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Item: Object did not get ID it asked for. Name: gates:thunder_detector Expected: 892 Got: 893

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Item: Object did not get ID it asked for. Name: gates:and_gate Expected: 893 Got: 894

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Item: Object did not get ID it asked for. Name: gates:frequency_changer Expected: 894 Got: 895

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Item: Object did not get ID it asked for. Name: gates:fast_repeater Expected: 895 Got: 896

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Item: Object did not get ID it asked for. Name: gates:slow_repeater Expected: 896 Got: 897

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Item: Object did not get ID it asked for. Name: gates:receiver Expected: 897 Got: 898

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Item: Object did not get ID it asked for. Name: gates:rain_detector Expected: 898 Got: 899

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Item: Object did not get ID it asked for. Name: gates:portable_redstone_transmitter Expected: 899 Got: 900

[Server thread/WARN] [ne.mi.re.ForgeRegistry/REGISTRIES]: Registry Item: Object did not get ID it asked for. Name: gates:nand_gate Expected: 900 Got: 901

And later on

[Server thread/WARN] [ne.mi.fm.se.LanguageHook/]: Skipped language file: gates:lang/en_us.json com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Expected name at line 37 column 2 path $.gui.gates.usage.frequency_changer at com.google.gson.Gson.fromJson(Gson.java:902) ~[server-1.15.2-extra.jar:?] {} at com.google.gson.Gson.fromJson(Gson.java:825) ~[server-1.15.2-extra.jar:?] {} at net.minecraftforge.fml.server.LanguageHook.loadLocaleData(LanguageHook.java:67) ~[?:?] {re:classloading} at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) ~[?:?] {} at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195) ~[?:?] {} at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1654) ~[?:?] {} at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) ~[?:?] {} at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) ~[?:?] {} at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) ~[?:?] {} at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) ~[?:?] {} at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:?] {} at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) ~[?:?] {} at net.minecraftforge.fml.server.LanguageHook.loadLocaleData(LanguageHook.java:61) ~[?:?] {re:classloading} at net.minecraftforge.fml.server.LanguageHook.lambda$loadLanguage$2(LanguageHook.java:86) ~[?:?] {re:classloading} at java.lang.Iterable.forEach(Iterable.java:75) ~[?:?] {} at net.minecraftforge.fml.server.LanguageHook.loadLanguage(LanguageHook.java:83) ~[?:?] {re:classloading} at net.minecraftforge.fml.server.LanguageHook.loadLanguagesOnServer(LanguageHook.java:109) ~[?:?] {re:classloading} at net.minecraftforge.fml.server.ServerLifecycleHooks.lambda$null$1(ServerLifecycleHooks.java:89) ~[?:?] {re:classloading} at net.minecraftforge.fml.DistExecutor.runWhenOn(DistExecutor.java:56) [?:?] {re:classloading} at net.minecraftforge.fml.server.ServerLifecycleHooks.handleServerStarting(ServerLifecycleHooks.java:89) [?:?] {re:classloading} at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:242) [?:?] {re:classloading,pl:accesstransformer:B} at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:611) [?:?] {re:classloading,pl:accesstransformer:B,re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,pl:mixin:APP:assets/immersive_portals/immersive_portals.mixins.json:altius_world/MixinMinecraftServer_A,pl:mixin:APP:assets/immersive_portals/immersive_portals.mixins.json:MixinMinecraftServer,pl:mixin:APP:assets/immersive_portals/immersive_portals.mixins_ma.json:MixinMinecraftServer_MA,pl:mixin:A,pl:runtimedistcleaner:A} at java.lang.Thread.run(Thread.java:834) [?:?] {} Caused by: com.google.gson.stream.MalformedJsonException: Expected name at line 37 column 2 path $.gui.gates.usage.frequency_changer at com.google.gson.stream.JsonReader.syntaxError(JsonReader.java:1559) ~[server-1.15.2-extra.jar:?] {} at com.google.gson.stream.JsonReader.doPeek(JsonReader.java:505) ~[server-1.15.2-extra.jar:?] {} at com.google.gson.stream.JsonReader.hasNext(JsonReader.java:414) ~[server-1.15.2-extra.jar:?] {} at com.google.gson.internal.bind.TypeAdapters$29.read(TypeAdapters.java:738) ~[server-1.15.2-extra.jar:?] {} at com.google.gson.internal.bind.TypeAdapters$29.read(TypeAdapters.java:714) ~[server-1.15.2-extra.jar:?] {} at com.google.gson.internal.bind.TypeAdapters$35$1.read(TypeAdapters.java:910) ~[server-1.15.2-extra.jar:?] {} at com.google.gson.Gson.fromJson(Gson.java:887) ~[server-1.15.2-extra.jar:?] {} ... 22 more