This is a patch release with only bug fixes and no new features included. Please see details below.
New Bug Fixes!
Android Renderer Fixes:
1. [[Android][Input.Choice] Spacing within Input.Choice sets not rendered.](https://github.com/microsoft/AdaptiveCards/issues/4016)
2. [[Android][Render Problem] [Buttons Disappear after clicking an Action.OpenUrl]](https://github.com/microsoft/AdaptiveCards/issues/4115)
3. [[Adaptive Cards / Platform Discrepancy] Excess spacing in empty text blocks](https://github.com/microsoft/AdaptiveCards/issues/3702)
4. [[Mobile][Usability] [No Chevron on Action.ShowCards]](https://github.com/microsoft/AdaptiveCards/issues/4167)
5. [[Mobile][Markdown support] [Markdown with the * does not work on mobile renderers]](https://github.com/microsoft/AdaptiveCards/issues/4117)
iOS Renderer Fixes:
1. [[iOS][InputField - Keyboard] [Japanese keyboard is not working properly with ACRTextField input field]](https://github.com/microsoft/AdaptiveCards/issues/4215)
2. [[iOS][ColumnSet] [Auto and stretch columns have the same behaviour]](https://github.com/microsoft/AdaptiveCards/issues/4052)
3. [[Ios] [Adaptive Cards Input Toggle(CheckBox) display issue in Iphone]](https://github.com/microsoft/AdaptiveCards/issues/3978)
4. [[Adaptive Cards / Platform Discrepancy] Excess spacing in empty text blocks](https://github.com/microsoft/AdaptiveCards/issues/3702)
5. [[iOS][Font color - Input Fields] [Font color in ACRTextView gets overwritten]](https://github.com/microsoft/AdaptiveCards/issues/4216)
6. [[Mobile][Usability] [No Chevron on Action.ShowCards]](https://github.com/microsoft/AdaptiveCards/issues/4167)
7. [[Mobile][Markdown support] [Markdown with the * does not work on mobile renderers]](https://github.com/microsoft/AdaptiveCards/issues/4117)
8. [[iOS][Rendering] Crash occurs when ColumnSet has `height: stretch`](https://github.com/microsoft/AdaptiveCards/issues/4105)
9. [[IOS][Layout] [When put submit button on the right column of the card, it could be cut off]](https://github.com/microsoft/AdaptiveCards/issues/4058)
UWP Renderer Fixes:
1. [[UWP][Image] [Image doesn't include spacing]](https://github.com/microsoft/AdaptiveCards/issues/4035)
2. [[UWP] Improve performance of base64 decoding](https://github.com/microsoft/AdaptiveCards/issues/4192)
3. [[UWP] JSON parsing performance](https://github.com/microsoft/AdaptiveCards/issues/4202)
4. [[Adaptive Cards / Platform Discrepancy] Excess spacing in empty text blocks](https://github.com/microsoft/AdaptiveCards/issues/3702)
5. [[Mobile][Markdown support] [Markdown with the * does not work on mobile renderers]](https://github.com/microsoft/AdaptiveCards/issues/4117)