I thought I was imagining it, but fairly certain that I am not.
Working on an app using CloudronVersions to publish, suddenly the app would not update in the Cloudron dashboard.
CloudronVersions.json is ~1600 lines long, from 0.0.1 to 0.7.5, jumping a few so about 60 versions
on last update CloudronVersions.json "lost" versions 0.7.2, 0.7.3 and 0.7.4 (and who knows what from earlier in the chain), so app running last version 0.7.4 would not find/recognise 0.7.5 as an upgrade
fixed by deleting versions 0.0.1 through 0.7.0 to shrink the file, copying 0.7.1 to 0.7.4 and manually editing values
app then says 'oooo, I see I am on 0.7.4 and found 0.7.4', and allows me to upgrade to latest 0.7.5
my build cycle is automated, I never touch CloudronVersions.json
Maybe lazy layman's diagnosis : some CLI bug in cloudron versions add loses content in Versions while adding a new one. Triggered by length limit or buffer constraint ?
Not a problem as such, as I now know how to fix it.
Surfacing this in case others come across it, maybe Cloudron team can check it when no other pressing tasks.