IO error: googleapi: Error 403: Insufficient Permission, insufficientPermissions

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Here are some logs that show the problem. First with -v and then -vv , same order of events. mount, copy a small file, then exit. Tried to keep it short and sweet.

2019/08/22 00:15:57 INFO : Storage bucket rclonestore: poll-interval is not supported by this remote
2019/08/22 00:15:57 INFO : Cleaned the cache: objects 2 (was 0), total size 1024.000M (was 0)
The service rclone has been started.
2019/08/22 00:16:02 INFO :
Transferred: 0 / 0 Bytes, -, 0 Bytes/s, ETA -
Errors: 0
Checks: 0 / 0, -
Transferred: 0 / 0, -
Elapsed time: 0s

2019/08/22 00:16:07 INFO :
Transferred: 0 / 0 Bytes, -, 0 Bytes/s, ETA -
Errors: 0
Checks: 0 / 0, -
Transferred: 0 / 0, -
Elapsed time: 0s

2019/08/22 00:16:11 INFO : SMALLFILE (10).txt: Copied (new)
2019/08/22 00:16:11 ERROR : SMALLFILE (10).txt: File.applyPendingModTime error: googleapi: Error 403: Insufficient Permission, insufficientPermissions
2019/08/22 00:16:12 INFO :
Transferred: 408 / 408 Bytes, 100%, 1.812 kBytes/s, ETA 0s
Errors: 0
Checks: 0 / 0, -
Transferred: 1 / 1, 100%
Elapsed time: 200ms

The service rclone has been stopped.
Terminate batch job (Y/N)?

Debug log:
https://pastebin.com/Mrp2Kt7B

The same error is in there, but I can't get anything more useful out of it personally. Heres a short selective snippet around the error (near the bottom of the full-size log)

2019/08/22 00:17:18 DEBUG : /: Getattr: fh=0xFFFFFFFFFFFFFFFF
2019/08/22 00:17:18 DEBUG : /: >Releasedir: errc=0
2019/08/22 00:17:18 DEBUG : /: >Releasedir: errc=0
2019/08/22 00:17:18 DEBUG : /: >Getattr: errc=0
2019/08/22 00:17:18 DEBUG : /: Releasedir: fh=0x7
2019/08/22 00:17:18 DEBUG : /: >Releasedir: errc=0
2019/08/22 00:17:18 DEBUG : /: Releasedir: fh=0x5
2019/08/22 00:17:18 DEBUG : /: >Releasedir: errc=0
2019/08/22 00:17:18 DEBUG : /: Getattr: fh=0xFFFFFFFFFFFFFFFF
2019/08/22 00:17:18 DEBUG : /: >Getattr: errc=0
2019/08/22 00:17:18 DEBUG : /: Opendir:
2019/08/22 00:17:18 DEBUG : /: OpenFile: flags=O_RDONLY, perm=-rwxrwxrwx
2019/08/22 00:17:18 DEBUG : /: >OpenFile: fd=/ (r), err=
2019/08/22 00:17:18 DEBUG : /: >Opendir: errc=0, fh=0x3
2019/08/22 00:17:18 DEBUG : /: Releasedir: fh=0x3
2019/08/22 00:17:18 DEBUG : /: >Releasedir: errc=0
2019/08/22 00:17:18 ERROR : SMALLFILE (11).txt: File.applyPendingModTime error: googleapi: Error 403: Insufficient Permission, insufficientPermissions
2019/08/22 00:17:18 DEBUG : SMALLFILE (11).txt: transferred to remote
2019/08/22 00:17:18 DEBUG : SMALLFILE (11).txt(0xc0000bc6c0): >close: err=
2019/08/22 00:17:18 DEBUG : /SMALLFILE (11).txt: >Flush: errc=0
2019/08/22 00:17:18 DEBUG : /SMALLFILE (11).txt: Release: fh=0x0
2019/08/22 00:17:18 DEBUG : SMALLFILE (11).txt(0xc0000bc6c0): RWFileHandle.Release nothing to do
2019/08/22 00:17:18 DEBUG : /SMALLFILE (11).txt: >Release: errc=0
2019/08/22 00:17:18 DEBUG : /: Getattr: fh=0xFFFFFFFFFFFFFFFF
2019/08/22 00:17:18 DEBUG : /: >Getattr: errc=0
2019/08/22 00:17:18 DEBUG : /: Getattr: fh=0xFFFFFFFFFFFFFFFF
2019/08/22 00:17:18 DEBUG : /: >Getattr: errc=0
2019/08/22 00:17:18 DEBUG : /: Opendir:
2019/08/22 00:17:18 DEBUG : /: OpenFile: flags=O_RDONLY, perm=-rwxrwxrwx
2019/08/22 00:17:18 DEBUG : /: >OpenFile: fd=/ (r), err=
2019/08/22 00:17:18 DEBUG : /: >Opendir: errc=0, fh=0x0
2019/08/22 00:17:18 DEBUG : /: Releasedir: fh=0x0
2019/08/22 00:17:18 DEBUG : /: >Releasedir: errc=0
2019/08/22 00:17:19 DEBUG : /: Getattr: fh=0xFFFFFFFFFFFFFFFF

If this is actually a simple permissions issue then I don't see what we could be missing.
This is on Google Cloud by the way, not Gdrive.