Bug: Like count is double-counted after opening Liked Items or refreshing Home

[VitaliiKoliuka]

Environment

• Branch: main
• Commit: 033379c
• Device: Vivo V2027
• Android: 10
• Test type: Manual testing on a physical Android device

Preconditions

• User is logged in.
• The tested product initially displays an outlined heart and like count 0.

Steps to reproduce

1. Open Home.
2. Tap the product heart once.
3. Open Profile → Liked.
4. Return to Home.
5. Refresh the Home feed.
6. Tap the same product heart once to unlike it.
7. Refresh the Home feed again.
8. Open Profile → Liked.

Actual result

1. After the first like:

   • the heart becomes red;
   • the count changes from 0 to 1.

2. In Profile → Liked:

   • the product appears once;
   • the heart is red;
   • the count displays 2.

3. After returning to Home:

   • the heart is red;
   • the count displays 1.

4. After refreshing Home:

   • the heart remains red;
   • the count changes to 2.

5. After tapping the heart once to unlike:

   • the heart becomes outlined/white;
   • the count changes from 2 to 1.

6. After refreshing Home again:

   • the heart remains outlined/white;
   • the count changes to 0.

7. In Profile → Liked:

   • the empty state is displayed;
   • the product is no longer present.

Expected result

• After liking a product with an initial count of 0, screen should display a red heart with count 1.
• Opening Profile → Liked should display a red heart with count 1.
• Refreshing Home should display a red heart with count 1.
• After unliking, the heart should become outlined and the count should immediately change to 0.
• Home and Profile → Liked should always show consistent data.

Reproducibility

Reproduced on the merged main branch on a Vivo V2027 physical device.

Impact

The like and unlike actions are persisted correctly, but the displayed count is inconsistent and temporarily double-counted across Home and Profile → Liked.

Evidence

video.Like.count.mp4

Related work

Observed after the liked-items implementation from PR #458 was merged.

[CherryCIC]

@VitaliiKoliuka have you tried with another post? I think I may have liked that one before, which could further identify the bug as being something happening more with the like count linking with the backend or firestore?

[VitaliiKoliuka]

@CherryCIC , I retested the same scenario with another listing that I had created and had not liked, while logged in with a different account.
The issue reproduced again. This suggests that it is not limited to the original listing or its previous like history.

video.pancho.Like.count.mp4