Missing Monte Carlo regions if zoom less than 100%

[GuidoBartoli]

System information

• mandelbulber2 => 2.28
• Operating System / Platform => Linux Mint 21 (64 Bit)

Detailed description

When the Monte Carlo algorithm is enabled and the zoom of the rendering window is less than 100%, the square tiles that are computed appear briefly and disappear immediately; they are practically invisible during rendering. With 100% zoom this does not happen and each region is shown until the algorithm moves on to calculate the next one.

Steps to reproduce

1. Load or create a new fractal
2. Enable Effects ---> Ray-tracing ---> Monte Carlo Algorithm
3. Launch rendering with Navigation ---> RENDER
4. Change the zoom in the main window to 50% or 25%
5. Take a look at the rendered image