I've noticed that you cant change the color of background on the shape when you apply text to it. It only changes the color of the text. And when the text frame is empty with no text inside and vhen you convert to curve the frame jumps to some random position.
Affinity Designer 15_05_2019 13_06_47.mp4
OS Name Microsoft Windows 10 ProVersion 10.0.17134 Build 17134System Type x64-based PCProcessor Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz, 2904 Mhz, 2 Core(s), 4 Logical Processor(s)Installed Physical Memory (RAM) 8.00 GBName AMD FirePr