parameter name collision confuses inputs ready check

https://help.galaxyproject.org/t/job-execution-error-tool-executes-too-early/3042/10

Start by reading the linked Galaxy help discussion, since the issue body contains no reproduction steps, files, tests, or entry point. Identify the parameter-name collision and the conditions that make inputs appear ready too early, then locate the affected workflow execution code. Done means the premature execution is prevented and the relevant behavior is covered by a regression test.

Written by the indexing model from the issue text.