On top of this, I've checked in the config and found the labels that I suspect are causing the issue.
Can I remove the one with the issue, data2 was the failed filesystem?
Data1 stile works fine but I have removed the references as advised.
<mntent>
<uuid>b1fa2a53-3b85-4ff1-8600-0adec1670262</uuid>
<fsname>/dev/disk/by-label/data1</fsname>
<dir>/srv/dev-disk-by-label-data1</dir>
<type>ext4</type>
<opts>defaults,nofail,user_xattr,noexec,usrjquota=aquota.user,grpjquota=aquota.group,jqfmt=vfsv0,acl</opts>
<freq>0</freq>
<passno>2</passno>
<hidden>0</hidden>
</mntent>
<mntent>
<uuid>21b2720c-12f0-418f-978c-016284e935f5</uuid>
<fsname>/dev/disk/by-label/data2</fsname>
<dir>/srv/dev-disk-by-label-data2</dir>
<type>ext4</type>
<opts>defaults,nofail,user_xattr,noexec,usrjquota=aquota.user,grpjquota=aquota.group,jqfmt=vfsv0,acl</opts>
<freq>0</freq>
<passno>2</passno>
<hidden>0</hidden>
</mntent>