Using LoadMyFingTags an error is pointed out:

Couldn't load certain entries with the tag mes:common_avoid: mes:tower (from Moog's End Structures), mes:decoration (from Moog's End Structures)

Attempting to locate these structures their tags are missing

Apparently, these tags may be broken, is it safe to ignore this, or worth looking into further?

Same Error here:

[Worker-ResourceReload-14/ERROR]: Couldn't load tag mes:common_avoid as it is missing following references: mes:tower (from fabric), mes:decoration (from fabric)

Fabric 1.20.1
Loader 0.15.9

Code line 1312
latest.log

fixed in next release