Steps to reproduce:
1. Open attached image
-> The equation is displayed as plain text in a single line
Build ID: 6c6b00300c5430466804619394b84beea01b3187
CPU threads: 4; OS: Linux 4.15; UI render: default; VCL: gtk3;
Locale: ca-ES (ca_ES.UTF-8); UI-Language: en-US
Build ID: c15927f20d4727c3b8de68497b6949e72f9e6e9e
Version 18.104.22.168.alpha0+ (Build ID: efca6f15609322f62a35619619a6d5fe5c9bd5a)
Created attachment 155303 [details]
comparison MSO 2010 and LibreOffice 6.4 Master
Created attachment 155304 [details]
OO didn't open this equation at all, not a regression. Repro 6.4+, new.
In Excel this seems to be an equation inside a drawing shape (light green area).
When trying to recreate this in Calc I was unable to insert an equation inside a drawing shape, Insert - Object - Formula always puts the equation outside the shape.