fix(engine) prevent MVCC race in blockRunWithWaitpoint pending check #4752

Job	Run time
e2e / 🧪 CLI v3 tests (windows-latest - pnpm)	3m 5s
typecheck / typecheck	3m 9s
sdk-compat / Node.js 22.12 (ubuntu-latest)	2m 0s
sdk-compat / Bun Runtime	1m 56s
sdk-compat / Node.js 20.20 (ubuntu-latest)	1m 39s
e2e / 🧪 CLI v3 tests (ubuntu-latest - npm)	1m 43s
e2e / 🧪 CLI v3 tests (windows-latest - npm)	3m 6s
sdk-compat / Deno Runtime	1m 54s
e2e / 🧪 CLI v3 tests (ubuntu-latest - pnpm)	1m 53s
units / packages / 🧪 Unit Tests: Packages (1, 1)	3m 6s
sdk-compat / Cloudflare Workers	2m 1s
units / webapp / 🧪 Unit Tests: Webapp (1, 8)	3m 8s
units / webapp / 🧪 Unit Tests: Webapp (4, 8)	3m 7s
units / internal / 🧪 Unit Tests: Internal (1, 8)	3m 6s
units / internal / 🧪 Unit Tests: Internal (3, 8)	3m 6s
units / webapp / 🧪 Unit Tests: Webapp (7, 8)	3m 7s
units / internal / 🧪 Unit Tests: Internal (2, 8)	3m 7s
units / internal / 🧪 Unit Tests: Internal (4, 8)	3m 7s
units / webapp / 🧪 Unit Tests: Webapp (6, 8)	3m 8s
units / webapp / 🧪 Unit Tests: Webapp (5, 8)	3m 7s
units / webapp / 🧪 Unit Tests: Webapp (2, 8)	3m 6s
units / internal / 🧪 Unit Tests: Internal (5, 8)	3m 5s
units / internal / 🧪 Unit Tests: Internal (8, 8)	3m 6s
units / internal / 🧪 Unit Tests: Internal (6, 8)	3m 7s
units / internal / 🧪 Unit Tests: Internal (7, 8)	3m 6s
units / webapp / 🧪 Unit Tests: Webapp (3, 8)	3m 7s
units / webapp / 🧪 Unit Tests: Webapp (8, 8)	2m 36s
units / packages / 📊 Merge Reports	1s
units / internal / 📊 Merge Reports	1s
units / webapp / 📊 Merge Reports	1s
	1h 14m 51s

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