It's late 2022 with the latest PS and still the same problem on my 5K 27in iMac. My workaround, when I lose track of the spot healing brush circle, is to hold down the Option key turning the brush into a target icon (or the ⌘ key shows a pointer), move it to the desired spot, let go the Option key or ⌘, and click to heal. A colour option would be really nice though.
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