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I have confirmed the issue. It occurs when a version is shared with subprojects.

Steps to reproduce:

1. Create a shared version in a parent project
2. Set any issue's target version to the shared version in the parent project and its subproject
3. On the gannt, collapse and expand the shared version in the parent project
4. The progress bar for the shared version should appear again after expanding the version but does not

Go MAEDA wrote:

I have confirmed the issue. It occurs when a version is shared with subprojects.

Steps to reproduce:

1. Create a shared version in a parent project
2. Set any issue's target version to the shared version in the parent project and its subproject
3. On the gannt, collapse and expand the shared version in the parent project
4. The progress bar for the shared version should appear again after expanding the version but does not

I also confirmed.
When the same shared versions are displayed multiple on Gantt, I can't figure out the target taskbar when collapsing one of these versions. To solve this, the top value at the time of initial display is set in the data-default-top attribute for each display item. This value is used as an attribute of the selector when to execute collapse/expand.
I have attached a patch.

Yuichi HARADA wrote:

I also confirmed.
When the same shared versions are displayed multiple on Gantt, I can't figure out the target taskbar when collapsing one of these versions. To solve this, the top value at the time of initial display is set in the data-default-top attribute for each display item. This value is used as an attribute of the selector when to execute collapse/expand.
I have attached a patch.

I could get the number of the current rows, so I remade the patch.

Setting the target version to 4.1.4.

Committed the fix. Thank you.