As stated in the title the mod uses an older version of conventional tags.
For example the #collections/mountains tag references #c:mountain and #c:mountain_peak.
Which has have been replaced with #c:is_mountain and #is_mountain/peak.

For a full list of then Fabric version of conventional tags v2 here is a link: /v2/ConventionalBiomeTags.java
As for Neo, from my knowledge conventional tags are similar across both loader so adding the new tags should also work on neo. But I may be wrong on this.

I’m the one who PR’d the convention tags to neoforge and fabric. I’ll go through again but generally repurposed structures does use the new tags. I may had missed a few

Well I'll be, i must had missed updating this mod. no idea how and I am upset at myself for it. I could've sworn I did go through and updated the tags at some point unless it was overwritten