Step to reproduce

1. download and start the ftb omnia 1.15.2 server once to generate necessary files.
2. edit the naturesaura's config and change this line
   auraTypeOverrides = ["yamda:yamda_dim->naturesaura:overworld", "yamda:yamda_nether_dim->naturesaura:nether"]
3. restart the server
4. use bottle in the yamda dimensions

Expect

Get the correspond aura bottles because we already override them.

Actually

Get bottle of substance

Hmm. Can you try changing your "double-quoted strings" to 'single-quoted strings' in the config value's array? I'm not sure if that'll make a difference, but it's worth a try.

Still not work, doesn't seems matter

Are you sure that that's the name of the dimension's type? Is there any information in the log?

I did a forge dimensions to list all dimensions

[12May2020 17:33:58.684] [Server thread/INFO] [net.minecraft.server.dedicated.DedicatedServer/]: Currently registered dimensions by type:
[12May2020 17:33:58.684] [Server thread/INFO] [net.minecraft.server.dedicated.DedicatedServer/]: Vanilla: minecraft:overworld, minecraft:the_end, minecraft:the_nether
[12May2020 17:33:58.685] [Server thread/INFO] [net.minecraft.server.dedicated.DedicatedServer/]: goodnightsleep:good_dream: goodnightsleep:good_dream
[12May2020 17:33:58.685] [Server thread/INFO] [net.minecraft.server.dedicated.DedicatedServer/]: goodnightsleep:nightmare: goodnightsleep:nightmare
[12May2020 17:33:58.685] [Server thread/INFO] [net.minecraft.server.dedicated.DedicatedServer/]: javd:void: javd:void
[12May2020 17:33:58.685] [Server thread/INFO] [net.minecraft.server.dedicated.DedicatedServer/]: moolands:moolands: moolands:moolands
[12May2020 17:33:58.685] [Server thread/INFO] [net.minecraft.server.dedicated.DedicatedServer/]: the_bumblezone:ultraamplified: the_bumblezone:bumblezone
[12May2020 17:33:58.685] [Server thread/INFO] [net.minecraft.server.dedicated.DedicatedServer/]: yamda:yamda_dim: yamda:yamda_dim
[12May2020 17:33:58.685] [Server thread/INFO] [net.minecraft.server.dedicated.DedicatedServer/]: yamda:yamda_nether_dim: yamda:yamda_nether_dim

This is what I get

Please attach a log file, there should be some info in it about a failed config parse.

Uploaded (the file is a bit giant)
https://gist.github.com/mmis1000/23aa3635f9ff3e2ace7c82e38d873c9a

Edited:
The config file is also attached

Could you try with this version and then send the log?
https://ci.ellpeck.de/job/NaturesAura/job/master/90/artifact/build/libs/NaturesAura-26.0.90.jar

Replaced the 23.0 jar with 26.0.90 jar you give, doesn't seems makes a different
https://paste.ee/p/ouGCC

Either the config is not loaded at all or the forge response with surprising value in world.getDimension() or world.getDimension().getType()?

I honestly have no idea how did it not work

Confirmed to be fixed in NaturesAura-27.0