Thunderbird Tags -> Labels Off-by-one

[Laura7089]

I'm using labels in my protonmail inbox to organise emails. In thunderbird, they are correctly loaded as tags, but when they are applied to emails, they sometimes are shifted up my inbox by one; ie. an email which has some Label1 according to proton will show in thunderbird as not having that label, but the email prior to it will (erroneously).

I'm unsure if this is a hydroxide issue or a thunderbird issue.

Using:

• hydroxide 0.2.29
• thunderbird 138.0