Expect no certain result from one session
Each spin starts on a 6x5 grid, and winning symbols are removed so new ones fall in from above. How often the bonus round comes is not known in advance, and nobody can predict it from one session. The result of any session is random, whatever the RTP the lobby runs.
Every spin on the reels follows the rules of one RTP version. Which version this lobby runs is shown only in the game rules, so read the RTP line there before you start a session. Both versions return a share of every bet over the long run, but the share differs between them.
Tumbles have no limit per spin, so a single spin can keep going while wins fall in. The maximum win is a ceiling that is reached very rarely. Read it as the limit set by the rules, not as a result to expect from any session.