Subscripted text shown as ordinary one (subscript is not applied)

[rrodionov91]

Steps to Reproduce

Click Open... button (Ctrl+O)
Select open from file
Select file: Subscript support.pptx
Click Open as New Project

Actual behavior
Subscripted text shown as ordinary one (subscript is not applied)

Expected behavior
Subscript is applied

Environment details

Ketcher Version 2.18.0-rc.5 Build at 2024-02-09; 17:07:18
Indigo Toolkit Version 1.18.0-rc.6+cdx.0-g99f004a82-x86_64-linux-gnu-11.4.0
Chrome Version Version 121.0.6167.161 (Official Build) (64-bit)
Win10
Issue found while testing epam/ketcher#3914

[AlexeyGirin]

Moved to 1.20 since not critical for the release (after discussion with @vanoprenko)

[AlexeyGirin]

Moved to Refined Backlog since not fixed over 2 releases