Good point @jan1234 .
Something was updated causing the model name to be changed from BLU Button1 to BTHome sensor. The blueprint will now show all BThome integration devices but at least you will be able to select the remote.
UPDATE CHALLENGE
As I had not set the source_url before you cannot re-import the updated blueprint. (it doesn’t know where to get it from).
#1 SOLUTION QUICK FIX
In the blueprint file in /config/blueprints/automation/duittenb/djs_bthome_shelly_4button_remote-ULTRA.yaml
update the following line from:
model: BLU Button1 to model: BTHome sensor
Then go to developer tools and click (reload) “AUTOMATIONS”.
#2 SOLUTION
In the blueprint file in /config/blueprints/automation/duittenb/djs_bthome_shelly_4button_remote-ULTRA.yaml
Just above “domain:” add or replace the source_url line with:
source_url: https://community.home-assistant.io/t/shelly-blu-rc-4-button-bluetooth-remote-djf3/867587
Then go to developer tools and click (reload) “AUTOMATIONS”.
Go to the blueprint menu, click the “3-dot” menu right of this blueprint and select “re-import the blueprint”.
#3 SOLUTION radical
Re-import this blueprint file as if it had not existed before. You will have to re-create your automations