Images are no longer displayed from version 1.19.
Probably because the version of ProtocolLib has been upgraded.

[04:46:50 INFO]: This server is running Paper version git-Paper-10 (MC: 1.19) (Implementing API version 1.19-R0.1-SNAPSHOT) (Git: bd097b4)

[04:46:52 INFO]: [ProtocolLib] Loading ProtocolLib v5.0.0-SNAPSHOT-b568

[04:46:53 INFO]: [YamipaPlugin] Loading YamipaPlugin v1.2.2

[04:47:36 WARN]: [ProtocolLib] Loaded class io.josemmo.bukkit.plugin.packets.SpawnEntityPacket from YamipaPlugin v1.2.2 which is not a depend or softdepend of this plugin.
[04:47:36 ERROR]: Packet encoding of packet ID 48 threw (skippable? true)
java.lang.NullPointerException: Cannot invoke "java.time.Instant.toEpochMilli()" because "instant" is null
at net.minecraft.network.FriendlyByteBuf.writeInstant(FriendlyByteBuf.java:697) ~[?:?]
at net.minecraft.network.protocol.game.ClientboundPlayerChatPacket.write(ClientboundPlayerChatPacket.java:49) ~[paper-1.19.jar:git-Paper-10]
at net.minecraft.network.PacketEncoder.encode(PacketEncoder.java:41) ~[paper-1.19.jar:git-Paper-10]
at net.minecraft.network.PacketEncoder.encode(PacketEncoder.java:14) ~[paper-1.19.jar:git-Paper-10]
at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:107) ~[netty-codec-4.1.77.Final.jar:4.1.77.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:717) ~[netty-transport-4.1.77.Final.jar:4.1.77.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:709) ~[netty-transport-4.1.77.Final.jar:4.1.77.Final]
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:792) ~[netty-transport-4.1.77.Final.jar:4.1.77.Final]
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:702) ~[netty-transport-4.1.77.Final.jar:4.1.77.Final]
at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:120) ~[netty-codec-4.1.77.Final.jar:4.1.77.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:717) ~[netty-transport-4.1.77.Final.jar:4.1.77.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:764) ~[netty-transport-4.1.77.Final.jar:4.1.77.Final]
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:790) ~[netty-transport-4.1.77.Final.jar:4.1.77.Final]
at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:758) ~[netty-transport-4.1.77.Final.jar:4.1.77.Final]
at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:1020) ~[netty-transport-4.1.77.Final.jar:4.1.77.Final]
at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:311) ~[netty-transport-4.1.77.Final.jar:4.1.77.Final]
at com.comphenix.protocol.injector.netty.channel.NettyChannelProxy.writeAndFlush(NettyChannelProxy.java:227) ~[ProtocolLib.jar:?]
at com.comphenix.protocol.injector.netty.channel.NettyChannelProxy.writeAndFlush(NettyChannelProxy.java:233) ~[ProtocolLib.jar:?]
at net.minecraft.network.Connection.doSendPacket(Connection.java:463) ~[?:?]
at net.minecraft.network.Connection.lambda$writePacket$11(Connection.java:437) ~[?:?]
at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:174) ~[netty-common-4.1.77.Final.jar:4.1.77.Final]
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:167) ~[netty-common-4.1.77.Final.jar:4.1.77.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470) ~[netty-common-4.1.77.Final.jar:4.1.77.Final]
at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:391) ~[netty-transport-classes-epoll-4.1.77.Final.jar:4.1.77.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:995) ~[netty-common-4.1.77.Final.jar:4.1.77.Final]
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.77.Final.jar:4.1.77.Final]
at java.lang.Thread.run(Thread.java:833) ~[?:?]

That's because Yamipa didn't support Minecraft 1.19 until today. You can download the latest release (v1.2.3) from this link.