Also having this exact issue! It only seems to work if all cookies are accepted.
Have tried adding the data-cookieconsent="ignore" data attribute to all gravity forms scripts we can find in the head (found on this forum post: Add data-cookieconsent="ignore" to Gravity Forms <script> tag) but that still doesn’t seem to help.
Currently awaiting a response from Cookiebot support but hoping someone here might have found a solution already!