"It's a feature, not a bug" as they say.
Seem like an extra unnecessary step. Unlike most other Adobe products where if you select a new tool the previous one becomes inactive, this one you have to switch off before you move on with your editing. Interesting choice.
By @Dave MP
So you've clicked first on the Heal tool, but then you clicked on the Zoom tool. So it makes sense that this tool is now active.
Yes, it is odd at first that both Heal and Zoom tools show as active (indented) but considering the behavior Rikk provided, it makes sense as you can toggle off the Zoom tool to Heal and back again. By design, the zoom tool can operate with other tools because we often want to use them, zoom then use them again. While Heal is active, the key commands make it quick to toggle between the two, so you don't have to click on the tools in the palette. The escape key disengages all the selected tools; that makes sense if you're done and now wish to use sliders. So yes, not a bug.
How would you prefer the tools to operate and would you be willing to explain this as a feature request? https://community.adobe.com/t5/photoshop-ecosystem-ideas/how-do-i-write-a-feature-request/idi-p/12384447
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