I just looked at the release notes for 5.1.0.11 when in their words:
A major part of this update are “just” updates to libraries and components that are not so much directly visible to the average user.
The changelog shows:
systemd - 238+git23-1.15.1.jolla – 238+git26-1.16.3.jolla
Tue Oct 14 2025 Pami Ketolainen - 238+git26
[systemd] Disable DNSSEC by default. JB#63704Fri Apr 11 2025 Jussi Laakkonen - 238+git25
[systemd] Enable resolved and myhostname in build. JB#63311Fri Jan 31 2025 Matti Lehtimäki - 238+git24
[systemd] Fix build with gcc 13 and newer. JB#62204
Which gives an insight to the Jenga they play trying to update the stack. The last change came in October, and it wasn’t until May that they were able to actually release it.