How to Reproduce:
1. Deconstruct a damaged building with a bot
2. Place the building using a bot with no full health buildings in supply for the bot to draw upon
If your bots are using repair packs to passively fix stuff around your factory this issue is barely noticeable because anything that takes damage will be fixed up before you ever get chance to deconstruct it. It becomes more of an issue when base crawling or if you're just a scumbag and want to cheat your way into free resources by micromanaging deconstruction/construction getting free heals to buildings without repair packs.
![Razz :P](./images/smilies/icon_razz.gif)
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I first noticed this when base crawling to clear out some of the larger Biter nests late game. I set down a line of walls using a blueprint ahead of my current turret protection wall, the bots take walls from a storage chest and place them. Then I have the bots deconstruct the previous wall using the deconstruction blueprint, they take the damaged walls that the biters have been biting back to the storage chest, and I move my turrets up. After this, if I look into the storage chest there's a dozen stacks of walls with various HP values. Now, if I send my bots to build more walls and there's no full health walls to use from the supply chest, the bots take the damaged ones and place them down, but they place them at full health.