I also wouldn't bet on the reliability of such tests too much. MacOS-betas are known to be changing a lot sometimes, so a "Reaper works fine" in one beta may change to "not working" in the next beta or the other way round.
The devs probably wait for the final release to do the necessary tweaks with the finalized one to avoid having to tweak/fix stuff twice, if necessary at all, doing other important stuff in the meantime.
At least, I would do it that way.
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