It looks to me like there is still infection in there. When you removed the scab before, did you do any squeezing or manipulating to see if anything would come out? What did the tissue underneath look like? The top foot (darker lesion) in particular, that looks like a bumble lesion to me, not a normal healing scab. Pus underneath can look white or creamy colored, and can adhere to the tissue, making it take some manipulation to get it all out. I would remove that scab again, and really work on cleaning it out, see if you can get anything more out of it. If you take some pictures during, and when finished, that would help a lot, so I can see better what's in there. Sometimes packing the hole with sugardine (I will put a link below to a thread on that) will help with getting it cleaned out and knocked back. I've had very good results with it. You may want to try that. Bumblefoot can be a slow process, sometimes repeated cleanings to get it all out, and then healing. It can take months sometimes, so persistence is needed.
"Sugardine works by combining the antimicrobial and antiseptic properties of povidone-iodine (Betadine) with the moisture-absorbing and tissue-nourishing qualities of sugar, creating a paste that draws out impurities, reduces bacteria, and supports the body's natural healing processes. The high sugar concentration prevents bacteria from growing by absorbing water, while the iodine acts as a broad-spectrum disinfectant. This dual action creates a poultice-like effect that cleans the wound and promotes rapid healing of tissues. "
Thread on sugardine is here, see post #8 here:
https://www.backyardchickens.com/threads/bumblefoot-not-healing.1443809/