background of edge label is white in pdf from flowchart

Describe the bug Colored background of flowchart edge labels becomes white when exported as pdf. Both svg and png look fine though.

To Reproduce I am converting basic.txt

using mermaid-cli 10.6.1 via

mmdc -i basic.txt -o basic.png
mmdc -i basic.txt -o basic.svg
mmdc -i basic.txt -o basic.pdf

Expected behavior The pdf should look like the png and svg.

Screenshots png: basic svg:

pdf file: basic.pdf pdf screenshot:

Desktop (please complete the following information):

OS: Windows 10
Browser: svg works in Firefox, MS Edge
Pdf Viewer: pdf looks wrong in Acrobat Reader 2023.008 and in TexWorks Pdf viewer, Gimp 2.10.36

Additional context ~~Side note, the inline display in Firefox 115.7.0esr (64-bit) looks wrong.~~ Seems fixed as of today 2024/03/06.

%%{
  init: {
    'theme': 'default'
  }
}%%

flowchart LR
   U --> |edge_label_text| B

screen shoot (from 2024/03/01):

mermaid-js / mermaid-cli