Tailor image element logo missing in workflow assignment mail

[kjuej]

I'm submitting a...

• [x] Bug report
• [ ] Regression (a behavior that used to work and stopped working in a new release)
• [ ] Feature request
• [ ] Documentation issue or request

Context

(Issue previously existed for invite mail: https://github.com/ExtensionEngine/tailor/issues/760, now it seems to only occur for workflow mail)