Hey @VeloRama_Twitch,
Thanks for your visit to the forums. 
It is indeed the case that there's a slight difference in cross-play amongst console generations. This information might help:
Edit: more clarification here.
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How many players does Battlefield 2042 support?
For the first time in Battlefield’s history, 128 players can join the all-out war at the same time**. This colossal player count equals entirely new gameplay opportunities and epic Battlefield moments.
**Xbox One and PlayStation®4 supports 64 players. 128 players and massive-scale maps are available on Xbox Series X|S, PC, and PlayStation®5.
Optimizations and differences between the 64 and 128-player experiences
On Xbox One and PlayStation®4 you will have access to the same gameplay features that we’ve announced for Xbox Series X|S and PlayStation®5. Weapons, Vehicles, Specialists and Gadgets all remain the same no matter what generation of console you’re playing on. Dynamic Weather events such as tornadoes, or Environmental Hazards like EMP storms will also be experienced by all players.
Our intention is to ensure that nothing detracts from the overall experience of playing Battlefield 2042. The main differences between console generations is that we’ve made adjustments to the playable area on the maps to ensure a fluid play experience for Xbox One and PlayStation® 4 consoles.
Cross-play in Battlefield 2042 beyond the Technical Playtest
We are still building cross-play functionality, and the first opportunity for us to test it with a wider, invite-only group will be within the Technical Playtest. Right now, we’d like to give you an understanding of what we’re looking to achieve as final functionality beyond the Technical Playtest, so here is an overview of what you can expect that to look like:
- PC, Xbox Series X|S, PlayStation®5 system (PC and console can opt-out from playing together)
- Xbox One and PlayStation®4 systems
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More information can also be found here: https://answers.ea.com/t5/Battlefield-Announcements/Battlefield-Briefing-Answering-Your-Reveal-Questions/td-p/10497692 🙂
Your feedback is greatly appreciated however and I will make sure to pass it on to the teams!