unknown follow "{mode}"; using "filtered". Known: {list}.

Warnings reference › source.derived.follow.*

Identifier

source.derived.follow.*

Raised by

The grid (core)

Since

1.10.0

What happened

follow decides which of the parent's rows the derived grid sees - everything, what the filters leave, what is selected. The value is not one of them, so filtered is used: the derived grid follows the parent's filters, which is the common case but may not be the one you meant.

The fix

Use one of the modes listed in the message.

Reference

Covered in full at the API reference.