- When playing AI, the first doesn't draw during draw phase.
- Field spell doesn't remove the existing spell. It will have two field spell.
- When the opponent activated a trap while I was attacking, I activated my royal decree and in that chain, he then, activated a dimension trap. When the chain started, my monster was banished and when the royal decree is on the chain, I got error.

These all are official rulings not bugs.

- When playing AI, the first doesn't draw during draw phase.
- Field spell doesn't remove the existing spell. It will have two field spell.

These are new rulings in the OGC. If you want to play without them, check the "Use Obsolete Rulings" checkbox before starting the duel.

- When the opponent activated a trap while I was attacking, I activated my royal decree and in that chain, he then, activated a dimension trap. When the chain started, my monster was banished and when the royal decree is on the chain, I got error.

You mean an error message or a crash? In this case, do you happen to have a screenshot of that situation? Do you remember, which trap got activated first before you chained Decree?

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error message

I don't have the screenies.

Sadly I don't.

Additional bug.

When I use instant fusion on ojama knight, the game won't proceed. What's going on?

Doesn't happen for me, the game proceeds as usual. Even the AI can use Instant Fusion to summon Ojama Knight without major problems. Again, do you have more details, maybe a screenshot?

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In here I summoned an ojama knight using instant fusion and it's been like that for a long time, it's from full time to that. The time was set to 999.

A few games later, I got this error. I hope I'm helping by being active at sending errors.