i loaded up my witch farm and all other mob types were spawning within the bounding blocks in which only witches were spawning before. In fact I got no witch spawns in about 20 minutes.
This seems to be an error in the mob spawning that needs to be fixed.
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Played and created it during the snapshots and it worked in every single one and now it has stopped.

Does MC-184740 describe your issue?

Yes

To be honest it probably is that issue as I haven’t used it for a while so may have only just noticed it

Please read the moderator note on MC-186096, and in the future, please be more vigilant when using snapshots as they are early development builds and can break things.
Have you loaded your world in any snapshots?