I recently updated to Dashboard version 2.27.0
Before I could have the "Placeholder" displayed after sending an empty string, payload=""; Right now it looks like impossible to get the Placeholder back on the selection bar. I tried with:
msg.enabled = true;
msg.enabled = false;
msg.payload = false;
msg.payload = "";
sending the optionlist again does not make a difference either.
Redeployment is the only way to get the Placeholder back. This worked well before although I cannot recall the Dashboard version I used before.
What to do?