Been playing a survival game since 18w50a and now converted to 19w02a since day of that snapshot release. I have enchanted many many items on the crafting table without noticing anything a-typical.
Today I did a level 3 enchant requiring 30 levels on a diamond helmet and I got both Projectile Protection 4 and Fire Protection 3 on the helmet. From past experience and lack of comment on the release notes, I assume all forms of protection are intended to be mutually exclusive.
Mac OSX 10.12.6, Java version 1.8.0_171
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However, this issue has been closed as a Duplicate of MC-141961.
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