Colors in Board Groups are too bright

Summary

Custom theme used:

{
  "awayIndicator": "#eea941",
  "buttonBg": "#43b581",
  "buttonColor": "#ffffff",
  "centerChannelBg": "#36393e",
  "centerChannelColor": "#e6e6e6",
  "codeTheme": "monokai",
  "dndIndicator": "#b74b47",
  "errorTextColor": "#fd5960",
  "linkColor": "#88a7ff",
  "mentionBg": "#7289da",
  "mentionBj": "#ffffff",
  "mentionColor": "#dcddde",
  "mentionHighlightBg": "#36393e",
  "mentionHighlightLink": "#88a7ff",
  "newMessageSeparator": "#eea941",
  "onlineIndicator": "#64b285",
  "sidebarBg": "#2f3136",
  "sidebarHeaderBg": "#282b30",
  "sidebarHeaderTextColor": "#818386",
  "sidebarTeamBarBg": "#202226",
  "sidebarText": "#dbdbdb",
  "sidebarTextActiveBorder": "#35363c",
  "sidebarTextActiveColor": "#dcddde",
  "sidebarTextHoverBg": "#35363c",
  "sidebarUnreadText": "#f8f8f8"
}

Steps to reproduce

Mattermost version: 5.5.1 (63830002741) OS: macOS Sonoma 14.0

Whenever Boards are fresh opened in the app the colors are too bright. What resolves it though is saving again the same custom theme settings. And it works fine until Boards are reopened again.

Expected behavior

Observed behavior (that appears unintentional)