Rowspan doesnt work in tables with multi-markdown plugin v4.0.0

[danypoup]

Environment

Joplin version: 1.0.178
Platform: Linux
OS specifcs: CentOS 7.7.1908

Steps To Reproduce

1. Enable multi-markdown plugin through "Tools/Options/Modules"
2. Create a new note and add a table like this one :
   Type | Info |||
   ---|---|---|---
   Server |
   ^^ | Node | master | slave
   ^^ | Name | server1 | server2
3. On preview tab, you should check that cells with "^^" are rendered as is and not merged with the "Server" one, like following picture shows (Joplin 1.0.178) :
   

Describe what you expected to happen:

On preview panel, cells under "Server" should be merged with it, so there should be only 2 lines under header line with "Server" text in first cell spanned on 2 rows, like following picture shows (Joplin 1.0.170) :

Logfile

Notes

1. This issue does not exist in v 1.0.170 where multi-markdown plugin is in v3.2.0.
2. Not tested but I guess that this issue exists since version 1.0.177 when multi-markdown plugin was upgraded from v3.2.0 to v4.0.0.