No other modules with that HC/UC. I had double-checked that because the "Christmas" one (the one with the problem) is used in the summer for the swimming pool. I've confirmed that this is the only "D15" AND there are no motion sensors with D14/D15 either.
Downloading: Yes. I've even cleared it many times AND swapped for the one in the garage (different HC) to see if it was a bad transceiver.
After doing more testing though, I can absolutely re-create the following: When I first add the module - as an Older Lamps LM465 - it successfully sends D15:ON. However, if I close AHP and then re-open it, then try the module again, it sends extended codes. Even though the module still shows as an Older Lamps (No Softstart) type.
(A note about my garage setup: It's version 3.228 - I'll NEVER upgrade it*. It's never failed me. Performing the same tests above the module and macros perform beautifully.)
*The "City/Time-Zone bug" has never been fixed from this version to the next so keeping my existing version works fine as long as I never try to change the time zone.