Adding new icon makes background curve out of sync

[klodha]

Describe the bug
When trying to add a new element in bottom navigation with index 4, Visual white curved background no longer stay in sync with elevated icons. It seems that

To Reproduce
Steps to reproduce the behavior:

1. In bottom_navigation_bar, go to line 168
2. add another instance of _icon with index 4.
3. Run app
4. White curved white bar which move with elastic effect no longer remains behind the selected icon.

Expected behavior
Curved background should dynamically adjust based on number of elements in bottom tabs.

Smartphone (please complete the following information):

• Device: Samsung Note 9
• OS: Android 10

[shivanigupta19]

Describe the bug
When trying to add a new element in bottom navigation with index 4, Visual white curved background no longer stay in sync with elevated icons. It seems that

To Reproduce
Steps to reproduce the behavior:

1. In bottom_navigation_bar, go to line 168
2. add another instance of _icon with index 4.
3. Run app
4. White curved white bar which move with elastic effect no longer remains behind the selected icon.

Expected behavior
Curved background should dynamically adjust based on number of elements in bottom tabs.

Smartphone (please complete the following information):

• Device: Samsung Note 9
• OS: Android 10

Please attach the image of the issue.

[TheAlphamerc]

Closing issue due to no response from @klodha . If someone facing the same issue feel free to reopen the issue.