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It looks as though 1.5.1.-1 is in the main depository, and it is 1.5.1 that is in the beta depository.
I've just gone from something like 18.104.22.168 to 22.214.171.124 without having the beta package installed.
After that, a refreshed upgrade tab does not include 1.5.1 as being available unless the beta package is installed.
Having the Beta package installed seems to make the beta repository take priority over the main repository.
I may have expected them to have equal priority, but whatever, the weirdness will go away if there are no conflicts between the two.
So @af123 just needs to remove the old rs 1.5.1 package from the beta repository.