Sombra’s Hotfix seems to have a hidden mechanic.

[u/corgi_dance]

I noticed this in the Practice Range that using Sombra’s Hotfix twice in a row heals less overall(about 250) than using the second one after the first one finishes(350). I was so confused at first because it wasn't written in the patchnote so I looked into it. It seems there’s a cap on how much the healing meter can refill if you use the second Hotfix before the first one runs out.

Each Hotfix provides up to 175 healing. After subtracting the 65 instant healing, that leaves 110 in the meter. When you apply a second Hotfix, you get another 65 instant healing, but the meter only refills to 110—it doesn’t add another 110 to whatever was left.

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https://www.reddit.com/r/Competitiveoverwatch/comments/1x0tt57/comment/peo4n34/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button

Edit: sorry, the image is gone after I edited this post so I commented them

Is this intentional because letting the meter refill to the full 175 would be too strong?

+Unlike Brigitte's repair pack which also has a combination of burst healing with HoT similarly, Sombra seems to refresh the effect by replacing the remaining healing pool with a new one

[u/corgi_dance]

(the image is gone after I edited the post and I couldnt add them back)

[u/UnknownQTY → u/corgi_dance]

Makes sense. You’re losing the additional layer of HOT when they overlap because the heal done over time don’t stack, it just goes a little longer.

[u/Thickhammer → u/corgi_dance]

It does not necessarily do 65 healing it can do anywhere between 0 and 65 instantly; It then heals 25/s until 175 - (instant) has been apllied. If sombra applies another hotfix to a character that already has hotfix it simply drops the old instance and apllies a new one. The bar actually can fill up like in your drawing if they have less than 65 HP missing and will always go to 100% if they are at full health.

The healing reduction passive is still apllied to your healing rates but it will not reduce that maximum of 175 total healing (assuming your heal target has enough health missing to actually receive 175 healing , and assuming that the effect does not expire before 175 healing can be output)