Otherwise, ProtectHome=tmpfs makes /home/ and friends not read-only. Also, mount options for /run/ specified in MountAPIVFS=yes are not applied. The function append_static_mounts() was introduced in 5327c910d2fc1ae91bd0b891be92b30379c7467b, but at that time, there were neither .read_only nor .options in the struct. But, when later the struct is extended, the function was not updated and they were not copied from the static table. The fields has been used in static tables since e4da7d8c796a1fd11ecfa80fb8a48eac9e823f06, and also in 94293d65cd4125347e21b3e423d0e245226b1be2. Fixes #34825.
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