Issue Summary

The smart value function replaceAll will not work with custom fields.

Steps to Reproduce

1. Create an automation rule with an edit issue action, selecting a custom field.
2. Attempt to update a custom field (short text) using the following smart value function or similar (this example removes all text within brackets):
   issue.<custom_field>.replaceAll("(.*?)","")
3. Nothing is captured and updated.

This works for system fields but not text fields tested working with:
issue.summary.replaceAll("(.*?)","")

Expected Results

The custom field value should be updated with the custom field value after manipulation via the smart value function.

Actual Results

Nothing is captured and updated.

Workaround

 I was able to successfully workaround this by creating a variable called <custom_field>ValueVar with the following value:

{{issue.<custom_field>}} 

And then performing the replace function on the variable instead:

{{<custom_field>ValueVar.replaceAll("\(.*?\)","")}} 

More information about creating variables here - Automation for Jira - Create variable (New component)