You’re absolutely right, and the collision was real enough to fix properly. Round markers in the Combat Add-on are now Rd# (Rd1, Rd2, Rd3) instead of R#. The [R:] prefix stays for rooms. In a combined dungeon+combat log the two are now unambiguous, and — as you noted — this also means translations don’t inherit the same letter conflict. Your [P:] / T# pairing for French is clean and compatible.
Combat add-on is now at v1.1.0. The Community Add-on Guidelines have also been updated with an explicit note about checking for collisions between tag prefixes and structural markers across the full ecosystem — so future add-ons shouldn’t run into this.
Thanks for flagging it while working on the French version. That’s exactly the kind of thing that only surfaces when someone tries to actually use everything together.