Thanks for filking the issue!

Unable to reproduce the issue on reported chrome version 72.0.3619.0 using Windows 10 with the below mentioned steps.
1. Launched Chrome
2. Installed the theme mentioned in comment#0
3. Opened multiple tabs and searched random content.
4. Switched between the tabs as fast as possible.
We didn't observe any inactive tab showing incorrect colours when hovered upon them as shown in 1.png

@Reporter: Could you please let us know if this is happening with any specific web page(s) and will it matter to have any specific number of tabs in order to reproduce this. Any further inputs from your end may be helpful to triage this further in a better way.

You need to hover over tab not switching to it. Problem doesn't occur in tabs you've already switched to once. Open one tab with google search results, open a link, then hover over tab while it's still loading. If problem didn't occured close the tab and please try again with different link. Here is a video: https://streamable.com/hufs9

The problem happens with all websites, number of tabs doesn't seem to matter.

Thank you for providing more feedback. Adding the requester to the cc list.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Re C#3: Tried even checking the issue by hovering over the tabs in comment#2. From C#3 tried hovering on the tabs which weren't opened (...by cmd + click on link) earlier. The issue is only getting reproduced while we are hovering on a tab when it's being loading.
This seems to be very inconsistent (i.e., we are hardly able to see this behaviour, once in ten trials) Hence removing Needs-Bisect label and marking it as Untriaged. Requesting someone from "UI>Browser>Themes" team to have a look into the issue for further inputs. 

Thanks!