Hazelcustomtoken keeps reappearing in one of my rules?

Hello all,

Hope someone can help with what I presume is a simple fix?

I duplicated a rule that was working. That rule watched for PDFs that met the criteria, and then sorted into subfolder with pattern — the latter being named with tokens [Name_ClientNumber], but only if that subfolder doesn't already exist (in which case, it is sorted into that folder).

I now duplicated this rule, and instead have the duplicate/new rule watching for Excel files, that meet the criteria.
I have checked with the "Preview Rule", and the condition matching is working.

The problem is on the action part of the rule.
At the "Sort into subfolder with pattern:" part, whereas the original rule (and a similar working one) has Name_ClientNumber that have been selected from my existing Token list (as the pattern to be used to rename/sort the subfolder) — the new rule keeps reverting back to hazelcustomtoken:Name_ClientNumber, and I have no idea why/where that "hazelcustomtoken" comes from?

When I try and delete it, and select the "Name" token again — it does allow it to be inserted (and appears as I expect it to), but soon as I click away to a different rule, and return to it again, the "hazelcustomtoken:" part has returned again. The second token ["ClientNumber"] after the "_" appears to be unaffected.
Underneath the token selector, I can see "Example: hazelcustomtoken:Name_ClientNumber".
But again, I don't know what is preventing me from selecting "Name", and having it save like that.

Any suggestions?
Pretty sure this is the error that is preventing the file from being sorted.

The token is being corrupted somehow. Can you email in to support with a video of this happening along with an exported copy of the rule?

Mr_Noodle wrote:The token is being corrupted somehow. Can you email in to support with a video of this happening along with an exported copy of the rule?

Thank you. Will give that a go. Good to know it's possibly not me being silly.

[Edit:] Email sent, with attachments — including RTF of crash log. Hazel crashed whilst making the recording, to show you what was happening.