Could not import text from <filename>

I have this problem now on particular PDFs since the latest version of Hazel. All rule criteria are satisfied (as verified in the preview) yet Hazel won't run the rule.
I'm running Hazel 4.2.6. on macOS High Sierra 10.13.5. Rebooting the Mac doesn't help.
When I click the eye to Show Rule Status, I can see the following against the file:
I've had this rule running for at least a year without fail. To my knowledge, the format of the documents (password-protected PDFs) has not changed.
The files contain SPI and I don't want to share them with tech support, though I'd be glad to do anything else to help with troubleshooting.
I'm running Hazel 4.2.6. on macOS High Sierra 10.13.5. Rebooting the Mac doesn't help.
When I click the eye to Show Rule Status, I can see the following against the file:
. Could not import text from /Users/<foobar>/Library/Mobile Documents/com~apple~CloudDocs/00-Inbox/<foobar.pdf>.
I've had this rule running for at least a year without fail. To my knowledge, the format of the documents (password-protected PDFs) has not changed.
The files contain SPI and I don't want to share them with tech support, though I'd be glad to do anything else to help with troubleshooting.