Webhook behavior expected?

I created a webhook that changes a field in a record, based on if a different field is modified. I chose a webhook because it works instantaneously, and it is such a simple thing I hate using an entire pipeline for one simple thing like this.

Webhook works fine except it does not work in grid edit mode (which is the reason I made the webhook in the first place instead of a dynamic form rule). In grid edit mode, if I change 5 records, the webhook fires correctly for the first record changed, but doesnt fire for the remaining records. I saw the limitations on webhooks were 50/second, so I imagine if I grid edit over 50 that could happen, but does anyone know why i cant even grid edit 2 records and have the webhook fire twice, once for each modification?