enforce-single-head = yes prevents commit, although there are no multiple heads

[Uwe Brauer]

> On Thu, Dec 17, 2020 at 2:03 PM Uwe Brauer <oub at mat.ucm.es> wrote:

> Yes, if the working directory parent has an active topic `hg heads` gives
> an incorrect result. There is a Merge Request to fix this which will be
> merged soon. See
> https://foss.heptapod.net/mercurial/evolve/-/merge_requests/286

That also may explain why 
enforce-single-head = yes prevents commit

Also there are no multiple heads?
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