Version of OpenTTD

I am using Linux (Ubuntu 20.10) and am using OpenTTD 1.10.3.

Expected result

Autoreplace protection (in the vehicles list) protects a group as well as all of its sub-groups.

Actual result

While it protects the vehicles in the immediate group, it does not protect its sub-groups.

For example, if I have group B in group A, and I start autoreplacing and protect group A, vehicles in group B will still get autoreplaced.

Steps to reproduce

1. Unzip and load the savegame attached.
2. Check the road vehicles window. Notice that I have set all MPS Regal Buses to be replaced by Foster Buses. Also look at the two groups, "Gufingfield" and "Betbourne". "Gufingfield" has been split into two groups, "Crosstown" and "East", with MPS Regal Buses within, while "Betbourne" only has a lone MPS Regal Bus. Both "Gufingfield" and "Betbourne" have been protected from autoreplacement.
3. Send all vehicles for maintenance to speed up autoreplace, and watch as the buses in the group "Gufingfield" get autoreplaced into Foster Buses, while the lone vehicle in "Betbourne" remains a MPS Regal Bus.

Further thoughts

While this could be considered proper behavior, if it is, it would be unintuitive, as one would expect making changes to a group would also make changes to its descendants, like setting the color livery, which also sets the defaults for the sub-groups.

Autoreplace cancel failure.zip