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3GPP registration settings not reset (PLS8)

With a Cinterion PLS8-E (AT) that is already registered in a 3GPP network using a user-requested operator and mode (--3gpp-register-in-operator / --set-allowed-modes), when only MM is restarted, the modem will stay registered with the configured settings and MM does neither detect the allowed mode and operator nor reset the manual registration settings.

~ # mmcli -m Modem1 --set-allowed-modes=4G
successfully set current modes in the modem
~ # mmcli -m Modem1 | grep 'current:'
           |                current: allowed: 4g; preferred: none

# Restart MM

~ # mmcli -m Modem1 | grep 'current:'
           |                current: allowed: any; preferred: none
~ # mmcli -m Modem1 --command='+WS46?'
response: '+WS46: 28' ### -> only 4G

~ # mmcli -m Modem1 --set-allowed-modes=4G
successfully set current modes in the modem
~ # mmcli -m Modem1 --set-allowed-modes=any
successfully set current modes in the modem

~ # mmcli -m Modem1 --command='+WS46?'
response: '+WS46: 25' ### -> any network selection (2G,3G,4G)
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