Due to changes to walls, "pack_format: 5" is not cross-compatible between 1.15 and 1.16

As the title says it would be wise to have the pack format value to be 6 because they are different block states in 1.16+ so technically a resource pack meant for 1.15+ you have selected is not compatible. Right now it does not give you the "incompatible pack" error message in resource packs selection menu when you have old 1.15 resource pack selected in Minecraft 1.16+.

Thank you.