I've just checked in Bionic:
$ uname -rvsop
Linux 4.15.0-10-generic #11-Ubuntu SMP Tue Feb 13 18:23:35 UTC 2018 x86_64
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu Bionic Beaver (development branch)
$ sudo apt list autofs
autofs/bionic,now 5.1.2-1ubuntu2 amd64 [installiert]
In this version the bug seems to be fixed. AutoFS works as expected.
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[SRU] [xenial] autofs needs to be restarted to pick up some shares
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