The version in 23.05 is 1.20.6 (so recent enough). But it seems from @balle15's testing that this may not work in 22.03.5.
The version in 22.03 is 18.6, but we need 18.8 or later.
Is there a good way to obtain a later version of a packaged program for a given OpenWrt release or branch when that later version hasn't been pulled in yet? Whilst I am sure it is terrible practice, in the past I just downloaded an .ipk for ModemManager version 1.18.12 from a snapshot that just happened to work.
I raised an issue here: https://github.com/openwrt/packages/issues/19794 back in November last year, and even the ModemManager maintainer has tried chasing it up, but the needed fix hasn't been added to OpenWrt even in master yet.
So for now it's still about just using my hack, but that requires upgrading to a version of ModemManager not yet provided in 22.03.